I'm lagging fps-wise while I store/take stuff from my chest where there are about 700+ items of armor/weapons. I'm a hoarder, I hoard all the stuff I find (from armor/weapon mods).

Each time I want to store something, I'm dropping to like 1-2 fps for about 1 second. It's annoying!

Any way to solve this problem?

How about splitting your storage bins? You could even make the game crash, if you put too much into one inventory.